anyconv

The one CLI command that replaces 50+ ad-ridden converter websites. Convert JSON, YAML, timestamps, colors, byte sizes, number bases, and base64 — all from your terminal. No browser. No ads. No CAPTCHAs. No data leaving your machine.

# One command. Any conversion. Instantly.
npx anyconv json yaml package.json
npx anyconv ts now
npx anyconv color "#ff8800"
npx anyconv bytes 1073741824
npx anyconv number 255
npx anyconv b64 encode "hello world"

Why anyconv?

Every developer has been here: you need to convert a Unix timestamp, figure out a byte size, or switch between JSON and YAML. So you open a browser. Search. Click past SEO spam. Dodge 14 popups. Close a "before you leave" modal. Paste your data into a sketchy website that probably sells it. Copy the result. Close 8 tabs.

There's a better way.

anyconv is a single npm package that lives in your terminal. It works offline. It respects your privacy. It's pipeable, scriptable, and composable with the rest of your toolchain. And it's 4.8 kB gzipped — smaller than a single JPEG on those ad-heavy converter sites.

Features

• JSON ↔ YAML — convert files or piped data instantly
• Unix timestamps — seconds, milliseconds, ISO 8601, locale, UTC — all at once
• Base64 encode/decode — without opening a sketchy website
• Color conversion — auto-detect hex, RGB, HSL — see all formats at once
• Byte size converter — decimal (KB/MB/GB) and binary (KiB/MiB/GiB) side by side
• Number base converter — decimal, hex, binary, octal — any input format
• Stdin support — pipe data through anyconv from curl, cat, or any other command
• Offline — zero network requests after install
• Private — your data never leaves your machine

Install

npm install -g anyconv

Or use instantly without installing:

npx anyconv --help

Requires Node.js 18+.

Quick start

# JSON to YAML
anyconv json yaml package.json

# YAML to JSON (pipe or file)
cat config.yaml | anyconv yaml json

# What time is 1748226460?
anyconv ts 1748226460

# What color is #ff8800?
anyconv color "#ff8800"

# How big is 1 GB in bytes?
anyconv bytes 1073741824

# What is 255 in hex?
anyconv number 255

Real-world examples

Convert an API response to YAML

curl https://api.github.com/repos/amitwaks/anyconv | anyconv json yaml

Pretty-print a JSON file

anyconv yaml json config.yaml  # round-trip: YAML → formatted JSON

Decode a JWT payload (without the website)

echo "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIn0" | anyconv b64 decode

Figure out deployment sizes

anyconv bytes $(stat -f%z dist/bundle.js)

Quick color palette exploration

anyconv color "#3498db"
anyconv color "rgb(52, 152, 219)"

Usage reference

| Command | Description | |---|---| | anyconv json yaml [file] | Convert JSON to YAML | | anyconv yaml json [file] | Convert YAML to JSON | | anyconv ts <timestamp\|now> | Unix timestamp to all date formats | | anyconv b64 encode <string> | Base64 encode | | anyconv b64 decode <string> | Base64 decode | | anyconv color <value> | Auto-detect hex/RGB — show all formats | | anyconv color hex <hex> | Explicit hex input | | anyconv color rgb <r> <g> <b> | Explicit RGB input | | anyconv bytes <number> | Byte count to all units | | anyconv number <value> | Decimal to hex, binary, octal | | anyconv number hex <value> | Parse as hexadecimal | | anyconv number bin <value> | Parse as binary | | anyconv number oct <value> | Parse as octal | | anyconv --help | Show help | | anyconv --version | Show version |

Roadmap

• URL encode/decode
• Hash generators (MD5, SHA-256)
• JWT decode and inspect
• HTML entity encode/decode
• String case conversion (camelCase, snake_case, kebab-case, PascalCase)
• Cron expression parser
• CSS unit converter (px, rem, em, %)

Why not just use a website?

| | anyconv | Converter websites | |---|---|---| | Works offline | ✅ Yes | ❌ No | | Private (data stays local) | ✅ Yes | ❌ Usually not | | Pipeable / scriptable | ✅ Yes | ❌ No | | Ad-free | ✅ Yes | ❌ 10-30 trackers per page | | CAPTCHA-free | ✅ Yes | ❌ "Are you human?" | | Bundle size | 4.8 kB | 2-5 MB of ads + tracking | | Speed | ~50ms | 2-5s (load + popups) |

Contributing

PRs welcome! The converter modules live in src/converters/ and are intentionally simple — each one is a self-contained function. Adding a new converter takes about 20 lines of code.

License

MIT — do whatever you want.